Update app.py

app.py

@@ -897,6 +897,6 @@ with gr.Blocks(css=css, theme=gr.themes.Soft()) as demo:
     sample_button3.click(handle_query, [sample_button3, chatbot], [chatbot])
     sample_button4.click(handle_query, [sample_button4, chatbot], [chatbot])
 
-    demo.unload(send_mail_with_history(chatbot))
+    demo.unload(send_mail_with_history,chatbot,None)
 #user_details for login page
 demo.launch(auth=[("lakshmi", "redmind"), ("arun", "redmind")])